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(c)
Clear DTC code.
(d)
Start and run the engine at idle speed to warm up the engine
for at least 5 min.
(e)
Road test the vehicle for at least 5 min.
(f)
Read control system DTC code again to confirm that the
system has no DTC code.
Next
Step 6
Diagnostic completed.
2.2.7.15 DTC P0030 P0031 P0032 P0053
1. DTC Descriptor:
DTC
P0030
Pre-Catalytic oxygen sensor heating control circuit open
DTC
P0031
Pre-Catalytic oxygen sensor heating control circuit short to ground
DTC
P0032
Pre-Catalytic oxygen sensor heating control circuit short to power supply
The Pre-Catalytic heated oxygen sensor (HO
2
S) is used for fuel control. The sensor compares the oxygen content in ambient air
with the oxygen content in exhaust flow. Each heated oxygen sensor has an internal heating element for sensor heating. ECM
controls the heated oxygen sensor heating control circuit. This makes the system enter into the closed-loop control mode earlier,
so that ECM can calculate Air-Fuel ratio earlier. ECM commands heater control module switched on or off, so that heated oxygen
sensor works within the specified working temperature range. Engine control module detects the temperature by Measure the heater
current.
The Pre-Catalytic heated oxygen sensor heating coil voltage is provided by The Main Relay, which is controlled by ECM. When the
ignition switch is turned to "ON" position, harness connector EN02 terminal No.1 voltage is provided by the battery. ECM controls
heater working time through ECM harness connector EN01 terminal No.6.
2. Conditions For Setting DTC and The Fault Location:
DTC Code
DTC Detection Strategy
Conditions For Setting The DTC (Control
Strategy)
Fault Locations
P0030
P0031
P0032
Hardware Circuit Checks
1. Circuit Open.
2. Circuit Short to Ground.
3. Circuit Short to Power Supply.
1. Sensor Circuit
2. Sensor
3. ECM
P0053
Resistance is greater than the
set value.
1. The current Pre-Catalytic oxygen sensor
internal resistance is greater than 1500 Ω.
2. The current exhaust gas temperature is
between 200°C (392 ºF) and 550°C
(1,022 ºF).
Engine
Control System JL4G18-D
2-79
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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